activeX and DirectShow linking

Hi all,

I have to convert my DirectShow progam (.exe) into an activeX. I got 2 linking problems (It's OK when I compile my ".exe"):

Quote:

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Strmbasd.lib(dllentry.obj) : error LNK2001: unresolved external symbol "class CFactoryTemplate * g_Templates" (?g_Templates@@3PAVCFactoryTemplate@@A)
Strmbasd.lib(dllentry.obj) : error LNK2001: unresolved external symbol "int g_cTemplates" (?g_cTemplates@@3HA)

---

I used:

Quote:

---

Strmbasd.lib winmm.lib

---

for linking.

I also try to link with strmiids.lib, but I still got these error.

Pls help. Thanks!

You have to declare the factory template for your filter(s) in your code. See Declaring the Factory Template in MSDN.

Hi RNEELY,

I only have one transform fillter based on I CTransInPlaceFilter, and I use this filter on my program only. So that I create the filter by new operator, I don't register that transform filter to the system.

I also declared a "factory template" as you said, the ActiveX was compiled well, but when I inserted the control by "ActiveX control Test container" from VC Tool, a messagbox display that the ActiveX does not registered.

I guess the DirectShow library have another CoGetClassObject differ from CoGetClassObject of MFC. So the system could not find my control becase it call CoGetClassObject of DirectShow instead of MFC's function.

Does anyone can help me?

Best regards!

Did you register your DLL? Download regsvr.reg from Chris Sell's tools. Double click it and enter info to the registry.

Open windows explorer and find your DLL. Right click on in and select "Register COM Server."

Try and run your app again.

Good luck.

Hi,

Thanks for your answer, here is the post I was talking about.

My problem is that I did not build any filter in my program, I only used the existing ones (RTPRender, ACM Wrapper, etc...). So I don't know how to fill the g_templates array, specially for the createinstance method...

I hope you can help me, :)

Thanks,
Have a nice day,

Jerome

I tried several ways to resolve, but I couldn't.

At the end, I used ATL (instead of MFC) to create my control and it worked well.

Hi,

Actually, in the first place I was working on an MFC program and everything was fine (as in your first message, the .exe was compiled and the program worked).

But now, I have to make it into a .dll and right now, the project is not using MFC. You say I need to build an ATL project to make it compile ?

Sorry, I'm a little bit confused...

Thanks,

Jerome

I also use MFC to create my program at first, my program worked well. But when I convert that program in to DLL, I couldnot compile it.

Then I create DLL by ATL (not MFC DLL), and my program can be compiled and work well. In ATL, you can create control by using ATL templates and you still can use all other MFC features if you need by check the "supported MFC option" when you create ATL project.

OK, I'll try that !

Thanks a lot. I'll tell you if it works.

Sorry I need some precisions...

In your ATL project did you need to declare the factory template or did you use some ATL Macros ?

Is it only the fact that the project is an ATL project that made it compiled and specially that made the "g_templates link error" disappear ?

Thanks :)

When I brought my project from MFC into ATL, I didnot have to declare g_templates..., I created a "full control", copy some functions from MFC program to my ATL control, and compiled successfully. The error "g_templates link error" didnot appear.

Thank you ! I'll do a copy of my code in an ATL project, without worrying about the "Factory template". I guess that ATL includes a Class Factory, that is called behind the CoCreateInstance method.

I don't know what you're working on, but if I can help you in the future, don't hesitate !

Bye
Jerome

:) :) :) :) Thanks!!!

Hi,

I've found a way to solve the problem without building an ATL project.

In the .h file where the filters are created, I've added the class :
class CFactoryTemplate
{
public :
CFactoryTemplate(){
};
};

And in the corresponding .cpp file, I've added :

CFactoryTemplate * g_Templates;
int g_cTemplates;

Unbelievable, but it worked !! I guess it works because I only use existing filters, but still, maybe it'll help you in the future.

Jerome

OK, it compiled well.

But do you try to use your control? If your control work well, please notify to me, I am not sure the control can work or not.